Optical identification of IGR J19140+0951

Abstract

IGR J19140+0951 was discovered by INTEGRAL in 2003 in the 4-100 keV band. Observations with INTEGRAL and RXTE provide a tentative identification as a high-mass X-ray binary (HMXB) with a neutron star as accretor. However, an optical counterpart was thus far not established, nor was the presence of a pulsar which is commonly observed in HMXBs. We observed IGR J19140+0951 with Chandra and find the source to be active at a similar flux as previous measurements. The lightcurve shows a marginally significant oscillation at 6.5 ks which requires confirmation. We determine a sub-arcsecond position from the Chandra data and identify the heavily reddened optical counterpart 2MASS 19140422+0952577 in the 2MASS catalog. Optical follow-up observations with the William Herschel Telescope at La Palma exhibit a continuum spectrum coming out of extinction above 7000 Angstrom without strong absorption or emission features. V, I and Ks band photometry point to an optical counterpart extincted by A[V]=11+/-2. The extinction is consistent with the interstellar value. None of the data reject the suspicion that IGR J19140+0951 is an HMXB with additional circumstellar obscuration around the accretor.

Accepted by Astronomy & Astrophysics. Major revision of original manuscript. Fig. 4 reduced resolution

References in corpus (7)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The USNO-B Catalog
• The optical/NIR counterpart of the INTEGRAL obscured source IGR J16318-4848 : a sgB[e] in a HMXB ?
• The Peculiar X-ray Transient IGR 16358-4726
• Unveiling the Nature of the High Energy Source IGR J19140+0951
• Chandra HRC Localization of the Low Mass X-ray Binaries X1624-490 and X1702-429: The Infrared Counterparts
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Cited by in corpus (9)

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• Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. II. The environment of the companion star
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• Unveiling the nature of six HMXBs through IR spectroscopy
• Near-infrared survey of High Mass X-ray Binary candidates
• Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations
• The nature of the infrared counterpart of IGR J19140+0951
• XMM-Newton discovery of mHz quasi-periodic oscillations in the high mass X-ray binary IGRJ19140+0951
• The Galactic high mass X-ray binary population with Fermi -LAT